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Geographic information is intrinsically spatial and it can be conveniently represented using a bi-dimensional space. Graphical user interfaces and visual languages can be used to satisfy this need. However the growing availability of sketching enables the users to have a more informal and natural approach in the interaction. For this reason this paper presents GSQL (geographical sketch query language),...
The main problem of visual query languages for geographical data concerns ambiguity of the query. In fact a query can have different visual representation and a visual representation of a query can have different interpretations. Increasing the number of the objects of the query increases the ambiguity. This ambiguity derives from the fact that a query can lead to multiple interpretations both for...
Set the date range to filter the displayed results. You can set a starting date, ending date or both. You can enter the dates manually or choose them from the calendar.